For technology to make meaningful improvements in health care, it has to penetrate communities across the country — so it’s a positive sign that digital health hubs are popping up nationwide (even though it could intensify the much-discussed “Series A crunch.”)

In total, April was an off-the-charts month for health technology funding, according to data from Startup Health. The sector raised a total of $322.72 million, which is an increase of 404 percent over the same period last year.

Here’s a quick look at last month’s activity:

Sensors again attracted a great deal of investor interest. In addition to the funding raised by Watermark, a company behind sleep monitoring technology, companies including MC10, which is working with Reebok on skullcap-like head impact monitor, and fetal monitoring system Sense4Baby raised funding.